There are several blogs of full time Airstreamers. My favorite is Watsonswander. 1999 25a pulled by a 4x4 Tundra. They move south for the winter. Last year down into Arizona this year they were in the Florida keys.
Regarding Lance trailers mentioned, the main reason I don't like them is they have a flat roof and they don't have ducted AC like most conventional brands.
I looked into a Bigfoot 25B25RQ (similar to AS 25RB floorplan) but found it not to be as spacious as our 25FB especially the bathroom. It has distinct advantages over the Airstream in construction and window are double pane but its not lightweight. They run about $48-$50k new. They offer another 25ft floor plan with the queen bed in the front and a rear bath, dinette and sofa opposite each other, L kitchen with little storage. In the end we decided to keep our 25fb.
Looked at the Oliver on their website. Its a large "Casita" with more frills but still has a wet bath and the same prices as a Bigfoot. We had a Casita before our Airstream so it has no appeal to us.
When we start our extended travels we aren't sure we will have a home base. Our current house is not suitable for retirement so we may sell it and head out and full time for a couple of years. Its a bucket list item for us to check off.